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Cold expansion effect on the initiation and the propagation of the fatigue crack

机译:冷膨胀对疲劳裂纹萌生和扩展的影响

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In this study, an experimental and numerical investigation was carried out to quantify the effect of the cold expansion on the initiation and the propagation of the fatigue crack. The fatigue life improvement of the damaged structures after the cold expansion process was investigated with the single edge pre-cracked specimens of aluminium alloy which are used in land transport components. Three radii and three degrees of cold expansion were performed at the crack tip. The number of cycles to obtain a new crack initiation (life time), are analysed from the different cases. A numerical investigation with a numerical code (FEM ANSYS code) is conducted to determine the residual stress field and the size of the plastic zone generated by the cold expansion and to establish the influence of the degree of cold expansion (DCE) on the different parameters. Three radii and six degrees of cold expansion were performed in this numerical investigation. It has been shown that the DCE has an influence on the size of the zone of compressive residual stresses (ZCRS) and on the size of the zone of plastic deformation (ZPD), but it appears that the DCE has no influence on the level of the maximum residual stresses in our case.
机译:在这项研究中,进行了实验和数值研究,以量化冷膨胀对疲劳裂纹萌生和扩展的影响。用用于陆路运输部件的铝合金单边预裂试样研究了冷膨胀过程后受损结构的疲劳寿命提高。在裂纹尖端进行了三个半径和三个程度的冷膨胀。从不同情况分析了获得新裂纹萌生的循环次数(寿命)。用数字代码(FEM ANSYS代码)进行了数值研究,以确定残余应力场和由冷膨胀产生的塑性区的大小,并确定冷膨胀程度(DCE)对不同参数的影响。在此数值研究中执行了三个半径和六个冷膨胀度。已经表明,DCE对压缩残余应力区域(ZCRS)的大小和塑性变形区域(ZPD)的大小都有影响,但是DCE似乎对压缩残余应力的大小没有影响。在我们的案例中最大的残余应力。

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